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04 trailblazer lights dimming/flickering


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04 blazer lights dim and flicker when heavy throttle applied. Noticed it bringing up rpms while it was parked as I can't drive it yet due to it having no lights/front end or wheels quite yet. Customer stated this same issue occurred when accelerating quickly. Also had an issue with big rpm drop and shuddering when ac would kick on and off before I started work on it and it appears that throttle body cleaning cleared that up. Still going to do full intake cleaning later but just noticed tis when trying to figure out dull thumping or tapping sound. Wouldn't so much call it a clicking noise like reported with fn clutch but could be wrong. This almost seems like valve knocking if the engine was made out of hollow plastic. It isn't constant or at a set interval and engine rpm doesn't alter sound. Possible idler arm? Possible bad alternator for light issue? There is also a pretty constant WHaT sounds like metal on metal grinding noise from alternator area. Any suggestions on what to check? Any help appreciated.

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